Rei Ayanami is a fictional character from the anime series Neon Genesis Evangelion. She is known for her pale blue hair and red eyes, often wearing a distinctive white pilot suit. Rei serves as a pilot for the giant bio-mechanical robot called Evangelion Unit-00, which is used to combat mysterious beings known as Angels. Rei's character is often portrayed as enigmatic and emotionally reserved. She has a complex relationship with other main characters, particularly Shinji Ikari, the series' protagonist. Throughout the series, Rei's origins and purpose are gradually revealed, contributing to the show's themes of identity and human connection.